Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1842735aac5dbe5…

MALICIOUS

PDF

98.8 KB Created: 2021-02-05 04:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cfff130a31e3117bd751c0982bb43bf5 SHA-1: 9f2329aa6109e142ce969668e2aa8c40a44e7a69 SHA-256: b1842735aac5dbe5e565e85d6be87d900ff9ec5fca172c954ddcd47f83d7518c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=verb+moods+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/gisanewat/ejj8FuS/didofefabifuzidisipe.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/iaheiiE/dazipinegebopanijamub.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/eheghih/battleground_fire_free_shooting_games_2019.pdfIn PDF document text
    • http://helpcopyright-service.com/46110248815si4p3.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/iejijhh/instagram_logo_vector_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/hiBgcL6/joragovu.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ufQxPgd/bekegugimazusofaxedov.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/gejcsxh/bandi_sanjay_anna_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/cvheYRf/mimpi_digigit_ular_putih.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/BSIiajh/greek_gods_of_mount_olympus_family_tree.pdfIn PDF document text
    • http://devlp.design/biblia_hebrea_peshitta_en_espaolmilvd.pdfIn PDF document text
    • http://wezituvod.22web.org/gps_arrow_navigator_pro_apk.pdfIn PDF document text
    • http://wajagokigipato.iblogger.org/28459898234.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/ivhfCad/9921202935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/89245667471.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/aggiornamento_android_8_huawei.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/bill_ted_s_bogus_journey_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/dell_command_update_2._4.pdfIn PDF document text
    • http://doliwoxebokuk.rf.gd/31528701492.pdfIn PDF document text
    • http://rugiwixet.epizy.com/zapapebuwodulop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 6828 bytes
SHA-256: 6b4d7653a71ae375013a77d629da279eed04c68cb0ec199fe72a9a5eebb515ee
font_01_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 3512 bytes
SHA-256: ec0d09dfda1cc78c7f7ad910303682d56042ef411a0a1692701d28cf9dacdd56
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 5396 bytes
SHA-256: 2fa0c2afee4e48ee016bc5b0d96d16ef72af2ff3ea31ce2ed224c5a1dee8a3a2
font_03_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 14520 bytes
SHA-256: 44fd4fe7a36e02961b6bd480b7f2dc6866e4919cd9d1d1e7140fc07167d56d49
font_04_sfnt_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 16272 bytes
SHA-256: 44f3d64c8274355cd1f21eda9d6ae104d469dbcb9eb277ba33b74e4c27f63a98